Two-factor paper wallet - Revision history

Waldyrious: tweak category sort key

2018-05-22T08:19:07Z

tweak category sort key

← Older revision		Revision as of 08:19, 22 May 2018
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	[[category:Security]]		[[category:Security]]
	[[category:Wallets]]		[[category:Wallets\| ]]

Belcher: old outdated idea, added link to mnemonic phrases page

2017-11-12T14:43:01Z

old outdated idea, added link to mnemonic phrases page

← Older revision		Revision as of 14:43, 12 November 2017
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			'''This is an old idea which is much better implemented by [[Mnemonic_phrase#Two-Factor_Mnemonic_Phrases\|Two-factor mnemonic phrases]]'''

	I believe it was Casascius that [https://bitcointalk.org/index.php?topic=56414.0 first talked about the idea] of a "2 factor paper wallet". TL;DR - it's a system to securely generate BTC addresses given the risk of any particular machine being injected with trojans.		I believe it was Casascius that [https://bitcointalk.org/index.php?topic=56414.0 first talked about the idea] of a "2 factor paper wallet". TL;DR - it's a system to securely generate BTC addresses given the risk of any particular machine being injected with trojans.

Ripper234 at 19:18, 30 December 2012

2012-12-30T19:18:03Z

← Older revision		Revision as of 19:18, 30 December 2012
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	I believe it was Casascius that ~~once~~ talked about the idea of a "2 factor paper wallet". TL;DR - it's a system to securely generate BTC addresses given the risk of any particular machine being injected with trojans.		I believe it was Casascius that [https://bitcointalk.org/index.php?topic=56414.0 first talked about the idea] of a "2 factor paper wallet". TL;DR - it's a system to securely generate BTC addresses given the risk of any particular machine being injected with trojans.

	(If you can find the original discussion, that would be great)		(If you can find the original discussion, that would be great)

Ripper234 at 05:11, 3 August 2012

2012-08-03T05:11:54Z

← Older revision		Revision as of 05:11, 3 August 2012
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	(If you can find the original discussion, that would be great)		(If you can find the original discussion, that would be great)

	See also [[User:Casascius/Base58Check-encoded_objects_proposal##Proposed_specification_for_a_multi-part_key_using_EC_multiplication\|this BIP]].		See also [[User:Casascius/Base58Check-encoded_objects_proposal#Proposed_specification_for_a_multi-part_key_using_EC_multiplication\|this BIP]].

	== How it works ==		== How it works ==

Ripper234 at 05:11, 3 August 2012

2012-08-03T05:11:28Z

← Older revision		Revision as of 05:11, 3 August 2012
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	(If you can find the original discussion, that would be great)		(If you can find the original discussion, that would be great)

	See also [[User:Casascius/Base58Check-encoded_objects_proposal\|this BIP]].		See also [[User:Casascius/Base58Check-encoded_objects_proposal##Proposed_specification_for_a_multi-part_key_using_EC_multiplication\|this BIP]].

	== How it works ==		== How it works ==

Ripper234 at 00:10, 3 August 2012

2012-08-03T00:10:33Z

← Older revision		Revision as of 00:10, 3 August 2012
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	(If you can find the original discussion, that would be great)		(If you can find the original discussion, that would be great)

			See also [[User:Casascius/Base58Check-encoded_objects_proposal\|this BIP]].

	== How it works ==		== How it works ==

Ripper234: Created page with "I believe it was Casascius that once talked about the idea of a "2 factor paper wallet". TL;DR - it's a system to securely generate BTC addresses given the risk of any partic..."

2012-08-02T05:47:33Z

Created page with "I believe it was Casascius that once talked about the idea of a "2 factor paper wallet". TL;DR - it's a system to securely generate BTC addresses given the risk of any partic..."

New page

I believe it was Casascius that once talked about the idea of a "2 factor paper wallet". TL;DR - it's a system to securely generate BTC addresses given the risk of any particular machine being injected with trojans.

(If you can find the original discussion, that would be great)

== How it works ==

# Trusted 3rd party generates a key pair (''Private_1'', ''Public_1''), and sends them to you in the form of laminated paper. ''Public_1'' is derivable from ''Private_1''. The keys are deleted after sending.
# You generate an addition key pair (''Private_2'', ''Public_2'') on your own machine.
# You cryptographically combine ''Public_1'' and ''Public_2'' and get ''Public_final'' - a Bitcoin address.
# You transfer BTC into ''Public_final''
# At a later time, when you want to withdraw funds from it, you combine ''Private_1'' and ''Private_2'' to get ''Private_final'', and withdraw.

The point of the system is that an attacker would have to break into both your systems in order to withdraw funds. It is a way to securely store Bitcoins even if your system potentially contains trojans, without trusting a 3rd party. This scheme can in fact be done with N parties, with each additional part just adding security to the system (suspect Party1 is a CIA snitch? That's ok, because all it takes for this to be secure is one secure party).

[[category:Security]]
[[category:Wallets]]